Classify the input using one of these labels: neutral, positive, and negative. @SouthwestAir boarding passes now compatible with #iPhone #Passbook 
http://t.co/1ESmMnIZEk
system
Classify the input using one of these labels: neutral, positive, and negative. @SouthwestAir boarding passes now compatible with #iPhone #Passbook 
http://t.co/1ESmMnIZEk
user
neutral
assistant
system
Classify the input using one of these labels: neutral, positive, and negative. @SouthwestAir boarding passes now compatible with #iPhone #Passbook 
http://t.co/1ESmMnIZEk
user
negative
assistant